China’s urbanization has entered a new stage with the promotion of “Carbon Peaking and Carbon Neutrality Goals” and “Urban Renewal Strategy”. Problems such as poor comfort, high energy consumption and unreasonable functions of existing buildings have attracted extensive attention from society. The climate-adapted human environment created by traditional buildings in the Lingnan region offers insights for the green transformation of buildings in this area. This paper summarizes the wisdom from the climate-adaptive construction of traditional buildings in Lingnan region, and proposes a green transformation design scheme that meets the requirements of energy efficiency and comfort, which provides a reference for the green renovation design of existing buildings.